The following game (exact match was not found in the recesses of the quiz room, if there is such, please let know the moderator to incorporate current one into the old one) is a mix up of 'cryptic clues' and 'letters' games. It works as follows:

Sample:

Quiz: (E) Union of bloodlines, named 'hero' in the Hobbit, father of sequel's hero's 'true love'
Answer: Elrond (union of blood - Maia, Human, Elf drops, father of Arwen (hero of the sequel - Aragorn, 'named the hero': [in the Hobbit - In those days of our tale there were still some people who had both elves and heroes of the North for ancestors, and Elrond the master of the house was their chief']

Next quiz should start with D, than (i.e. the last latter of the previous quiz answer)
The person to answer should be able to explain all clues of the question, besides giving the answer to the quiz itself

So:

D

There were several of the name, humans and elves alike. The answer I'm after was the second among humans, wise to an extent, proud beyond measure, labelled 'heathen' by an 'emissary'.

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EDIT: the hard quote posted by Perky brought to my attention that the guidelines for giving hints and clues are not set. Therefore I edit this post to set the following additional rule:

If the quiz is not solved for ten days, the author should reveal its second letter. Par example, if Elrond was not got for ten days, I would have been obliged to tell you that the word I were after started with El

Is the answer Denethor II ? There were three Denethors, the elf, human 1, and human 2. This is the second human named Denethor. He was wise, until he was overtaken by the palantir. He was so proud he underestimated his enemy, and I believe Gandalf called him a heathen?

I am so confused, but I'm having fun trying!

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'But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.'

Wait, why R? Is it the last letter of the answer? Anyways...I think I get it now...

R

Brought from the outlaw, bound to the friend of he who pours, bringer of the messenger, and bringer of the bringer of a small one's safety.

Have at it!

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'But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.'

Brought from the outlaw- Not too sure about that one.
Bound to the friend of he who pours- Bound to Yavanna, who is Manwe's friend (Manwe controls the rains of Arda)?
Bringer of the messenger- Brought Gwaihir to Gandalf in Orthanc?
Bringer of the bringer of a small one's safety- Brought Gandalf who brought Gwaihir who saved Frodo and Sam from Mount Doom?

Sorry, but It's not Radagast. But if it helps, Radagast was my first choice for R, but I came up with a better one

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'But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.'

Brought from the outlaw - i.e. Roheryn was already Aragorn's horse at a time he was Strider, i.e. outlaw.

Bound to the friend of he who pours - m-m-m, hard one, that, Halbarad brought the horse, right? He probably was visiting Bree just like his chief, so 'he who pours' would be Barliman, pouring beer into their mugs or something.

Bringer of the messanger - Roheryn brought Halbarad, who was a messanger?

Sorry, but that's wrong. Fingolfin II's second and last guess were pretty close, though...

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'But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.'

Brought from the outlaw - brought from Gollum, who, being yet a Smeagol, was outlawed by his family.

Bound to the friend of he who pours - he who pours would be Morgoth here - that is, who pours (or used to) his power into the very matter of the world. The Ring is bound to 'his friend' - Sauron

Bringer of the messanger - by implication, the Ring brought Sauron's messanger to Dain Ironfoot.

Bringer of the Bringer etc... The ring brought its bringer (Frodo) adn its another bringer (Gollum) to Mount Doom, where Gollum's actions brough small one's (Frodo again) safety - not physically, but on spiritual level - releasing him from the Ring itself

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'But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.'

Frightened by the hardness of your question, I've set rules for hinting (see the initial post up there). All I have to do is to wait another week and get the second letter to lighten my task, unless someone gets it before

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'But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.'

The place I'm after was wide and empty. Once it was to the East of the green plain, to the North of the place were eldest son and his riders have taken their guard. Before that, the former eldest son was rescued by another eldest son.

The place I'm after was wide and empty. - It was a plain.
Once it was to the East of the green plain, (Ard-galen) to the North of the place were eldest son and his riders have taken their guard. (Himring)
Before that, the former eldest son was rescued by another eldest son. - Maedhros being rescued by Fingon?

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There are three kinds of people in this world. Those who can count, and those who can't.

Married to the greatest - wife of Fëanor, allegedly greates elf in history
the only one he would listen to - self-explanatory
Gave birth to the Fair - mother of Celegorm the fair
and to the proudest - mother of Caranthir the dark
and the one who was uniting - Maedhros who formed Union of, yes, again Maedhros
Fate is unknown...